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Plethoschisma

Rhombifera - Pleurocystitidae

Taxonomy
Plethoschisma was named by Sprinkle (1974) [Sepkoski's age data: O Llvi-l Sepkoski's reference number: 325]. Its type is Plethoschisma grandis.

It was assigned to Pleurocystitidae by Sprinkle (1974); to Rhombifera by Sepkoski (2002); and to Deltacystinae by Sumrall and Sprinkle (1995) and Nardin and Bohatý (2013).

Synonymy list
YearName and author
1974Plethoschisma Sprinkle p. 1187
1995Plethoschisma Sumrall and Sprinkle p. 776
2002Plethoschisma Sepkoski, Jr.
2013Plethoschisma Nardin and Bohatý p. 541

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
RankNameAuthor
subphylumBlastozoaSprinkle 1973
classRhombiferaZittel 1879
superfamilyGlyptocystitoidaBather 1899
familyPleurocystitidaeNeumayr 1889
subfamilyDeltacystinae
genusPlethoschisma

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
J. Sprinkle 1974Large pleurocystitid cystoids having a flattened triangular calyx with a strongly asymmetrical profile. Plating irregu- lar; BB, ILL, and LL circlets well developed, but RR and 00 circlets reduced. Size of peri- proct and ventral plating poorly known, but many small periproctals apparently present. Two strongly compressed conjunct rhombs (B2/IL2 and L3/L4) present on dorsal sur- face bearing as many as 130 apparently discrete dichopores. Two long biserial brachioles attached to summit beside central mouth with brachiolar food groove running along inside dorsal surface. Enlarged proximal stem con- tains ridged outer colum